diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index 230789f29ff788..034c83a19fd085 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -2139,6 +2139,24 @@ def test_warning_notimplemented(self):
with self.assertWarns(DeprecationWarning):
self.assertFalse(not NotImplemented)
+ def test_singleton_attribute_access(self):
+ for singleton in (NotImplemented, Ellipsis):
+ with self.subTest(singleton):
+ self.assertIs(type(singleton), singleton.__class__)
+ self.assertIs(type(singleton).__class__, type)
+
+ # Missing instance attributes:
+ with self.assertRaises(AttributeError):
+ singleton.prop = 1
+ with self.assertRaises(AttributeError):
+ singleton.prop
+
+ # Missing class attributes:
+ with self.assertRaises(TypeError):
+ type(singleton).prop = 1
+ with self.assertRaises(AttributeError):
+ type(singleton).prop
+
class TestBreakpoint(unittest.TestCase):
def setUp(self):
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